Inserting the Collimator Mandrel

The SAC mandrel (or spigot) is engineered and manufactured very precisely in order to make it rigid and durable AND to protect the barrel. However, shooters should still be careful when inserting the mandrel in order to prevent damage to the SAC or the weapon. Have a buddy help with this process whenever possible.

ALWAYS avoid putting excessive off-axis (up/ down/ left/ right) pressure on the collimator. Doing so can bend the collimator mandrel and/ or damage the weapon.

Any time the mandrel is inserted:

  1. ENSURE that the weapon is CLEAR and on SAFE.
  2. If possible, clean and lightly oil the mandrel prior to use.
  3. Carefully insert the mandrel into the barrel of the weapon, getting the rubber buffer as close as possible to the end of the barrel/ flash hider without actually contacting it. It is best to insert the SAC the same way each time- we recommend inserting it with the optical housing at the 9 o’clock position (from the shooter’s perspective).
  4. Rotate the SAC clockwise to the vertical position (be as precise as possible).


Telluric Group, LLC
136 Venture Drive
Brunswick, GA 31525 USA


Follow our family of companies on social media to keep up with events, courses, informational videos, and more!

Copyright 2020 Telluric Group, LLC. All rights reserved.